For this chain-of-thought reasoning and answer, what was the question?
To answer the question, consider the following: On August 22, 2017, Thomas was traded, along with Jae Crowder, Ante Žižić, and the Brooklyn Nets' unprotected 2018 first-round draft pick, to the Cleveland Cavaliers in exchange for Kyrie Irving.
 A: August 22 , 2017
Q: On August 22, 2017, Thomas was traded, along with Jae Crowder, Ante Žižić, and the Brooklyn Nets' unprotected 2018 first-round draft pick, to the Cleveland Cavaliers in exchange for Kyrie Irving. However, during the post-trade physical examination by Cleveland staff, concerns were raised about the health of Thomas' previously injured hip. As a result, eight days after the deal was announced, the Celtics agreed to send the Cavaliers a 2020 second-round draft pick via the Miami Heat to complete the trade. It was later reported that Thomas had been playing with a number of secondary issues in his hip, such as a loss of cartilage and some arthritis, for a number of seasons. On September 25, 2017, the Cavaliers deemed him a possibility of playing by the end of the year. On December 21, 2017, Thomas scrimmaged with the Canton Charge of the NBA G League and dressed for the first time since joining the Cavaliers, suiting up but not playing against the Chicago Bulls. On January 2, 2018, Thomas made his long-awaited debut for the Cavaliers, scoring 17 points in 19 minutes off the bench in a 127 -- 110 win over the Portland Trail Blazers. A day later, Thomas returned to TD Garden. Although he did not play in the Cavaliers' 102 -- 88 loss to the Celtics, Thomas received a standing ovation from the Celtics' fans. On January 6, he had 19 points and four assists in his second appearance and first start of the season in a 131 -- 127 win over the Orlando Magic. On January 20, he scored a season-high 24 points in a 148 -- 124 loss to the Oklahoma City Thunder.

Based on this passage, when did isaiah thomas go to the cavs?